JPS60232876A - Saw-tooth for cutting concrete - Google Patents

Abstract

PURPOSE:To improve the welding quality of baseboard and chip thus to improve the jointing strength of saw-tooth by welding a chip having an interface layer of high weldability at the jointing portion and a baseboard through high energy density beam. CONSTITUTION:Metal for improving weldability while having affinity with base material is welded or casted at the jointing side with a baseboard 1 or the innercircumferential side of chip 2 to form an interface layer 21. Then said chip 2 and the baseboard 1 are jointed integrally through irradiation of high energy density beam such as electron beam or laser beam thus to improve the welding quality of chip 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a saw blade for cutting surface portions of concrete, asphalt roads, etc.

[Prior art]

The saw blade, which is generally used to completely cut into the surface layer of concrete or asphalt roads, has a structure as shown in Figure 3. In Figure 3, (,) is a plan view,
The first phrase is its AA cross-sectional view.

(1) is called a substrate and (2) is called a chip, and their components are adjusted depending on the type of object to be cut.

The main component of the chip (2) is WC (tungsten carbide), whose fine particles are sintered with a metal called a binder such as Co, Su, or Cu, which has extremely high hardness and excellent wear resistance. ing.

Next, a method of manufacturing this saw blade will be explained. In the above saw blade, the substrate (1) and the chip (2) are integrated by bonding, and silver brazing or the like is generally used as the bonding method. In this method, a dust brazing material (not shown) heated to a predetermined temperature by means such as high frequency heating or burner heating is added to the joint between the chip (2) and the substrate (1), and brazing is performed. However, if the heating range is wide, the heating method IW becomes slow and takes time, which causes many problems such as the hardness of the substrate (1) decreasing. For these reasons, bonding methods such as electron beam welding and laser welding have recently been adopted and have begun, but chips (
2) There was a problem with the material, and it was difficult to obtain good bonding quality. As mentioned above, the component of this chip (2) is a hard metal such as tungsten carbide, which has poor weldability, so it may cause contact defects such as cracks and bubbles during welding. There were some easy drawbacks.

[Summary of the invention]

Does the present invention have the above drawbacks? Exclusion<fr has been made,
The side of the chip that is connected to the substrate has a material that is compatible with the substrate material.
Is there a metal that does not have any negative effects metallurgically even if it is melted and mixed? A boundary layer for joining is formed in advance by adhering by thermal spraying or overlay welding, or by casting during sintering and forming. This is a saw blade for cutting concrete, which is characterized in that it is joined using.

[Embodiment of the invention] Is Fig. 1(a) an embodiment of the invention? FIG. 1 (6) is an external view of the chip shown in FIG. Chip (
2) The inner circumference 98, that is, the side to be joined with the substrate (1), is compatible with the substrate material c (high carbon steel) and has good weldability. A boundary layer (20) is formed by welding or casting the entire metal.Then, the substrate (1) is formed using the manufacturing apparatus shown in FIG.
It is to be joined with.

Next, the entire joining method will be explained with reference to FIG. Figure 2 (4
) is a partial plan view, and section C is its AA cross-sectional view. The substrate (1) is fixed to the support base (4) by the holding plate (3) with fixing bolts (5). The chip (2) is fixed in position by the chip holder (6) and is pressed against the substrate (1) by the force of the pressure spring (7).
) The positive pressure (a) is adjusted with a pressure adjustment bolt (8), and the tip pressure movement and amount of movement are adjusted in advance with a set screw (9). After being set in this way, a high-energy density beam (1
By irradiation of 01), they are attached and integrated. In addition, in order to form a peak, there is a groove ←η on the support base (4) on the back side of the irradiation side.
is provided.

According to such a bonding method, the diameter of the irradiation beam is very small and the width is narrow, and the bonding can be performed using oTi@.

- For example, it has been confirmed that the boundary layer υ may be approximately 0.5 to 10++II++. Also, the material of the boundary layer CD is often nickel or nickel alloy.J The idea is that the substrate (1) and the chip (2) are basically fused together, but only the boundary layer CD is also fused together. It is also possible to use a bonding method in which the material is pressed against the substrate (1) side, and in such a case, a low melting point metal such as copper is suitable as the material for the boundary Cυ.

〔Effect of the invention〕

This invention improves the quality of welding between a substrate and a chip, which has been considered difficult in the past, and the saw blade manufactured thereby has superior bonding quality and is useful for reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is an external view of a chip according to the present invention, FIG. 2 is a schematic diagram of a device for joining the chip and a substrate, and FIG. 3 is an external view and sectional view of a saw blade for cutting concrete. 1: Substrate, 2: Chip, Filter: Holding plate, A: Support stand, 5:
Fixing bolt, 6: Chip holder, 7: Pressure spring, 21: Boundary layer, 101: High energy density beam. Note that the same reference numerals in each figure indicate the same parts. Agent Patent Attorney Miaki Kimura Figure 1 (0) 1 (b) and 1 to Figure 2 (0) (b) Figure 3 (Q) Written amendment to procedure (voluntary) July 1980 3 [ 1 Mr. Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 59-89524 2. Title of the invention: Concrete cutting saw blade 3. Person making the amendment 4. Agent

Claims (2)

[Claims] (1) Boundary layer k with good weldability at the joint with the inner board
'7 High energy density beam between chip and substrate? A saw blade for cutting concrete, characterized in that it is joined using a saw blade. (2) A boundary layer with good weldability at the joint part with the substrate on the inner peripheral side of the chip is made of a metal whose main component is copper, nickel, or an alloy thereof. A saw blade for cutting concrete as described in Scope 1.